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Accavallo fought mainly in Argentina. On March 1, 1966 he won the vacant WBA & WBC world flyweight championship by outpointing Katsuyoshi Takayama on a 15-round split decision in Tokyo, Japan.[1][2][3][4][5] Accavallo had been the number two contender for the title held by Salvatore Burruni, but Burruni chose to defend the title against someone other than Accavallo. The WBA & WBC had mandated that Burruni fight Hiroyuki Ebihara (the number one contender). The WBA & WBC stripped the champion of his crown and sanctioned the Accavallo - Katsuyoshi Takayama (the number three contender) match for the title. Accavallo retired as the reigning WBA & WBC champion after escaping with a controversial 15 round majority decision victory over former world flyweight champion Hiroyuki Ebihara.[6]